This is great. One of those obvious-in-hindsight techniques. Fractal noise is pretty simple, Perlin noise being the most popular. It's easy to think of this as

This is great. One of those obvious-in-hindsight techniques. Fractal noise is pretty simple, Perlin noise being the most popular. It's easy to think of this as being the SDF equivalent. I can't think of how a Simplex-noise equivalent might work, as displacing spheres by a vector might have the same issues as naive noise in terms of continuity.